# Hardware Requirements The treadmill run sensor requires 2 main components: * Infrared reflection sensor E18-D80NK - ![](/files/0UR5jIz25MSeISVLVHmJ) ![](/files/GZTagAFGZKungvCJso8A) * ESP32 DevKit microcontroller (with Micro-USB) - preferably use a microcontroller that has an onboard antenne to have a stronger bluetooth signal. ![https://docs.espressif.com/projects/esp-idf/en/latest/esp32/hw-reference/esp32/get-started-devkitc.html](/files/EY3MiM9QXFP7IUF8MeX8) Connect the IR sensor to the pins of the ESP32 as shown above. The sensor requires 5V and its digital output signal is connected to **GPIO5** on the ESP32. {% hint style="info" %} The ESP32 pin layout may vary depending on the manufacturer ! {% endhint %} --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://bluetrack.bluesense.be/introduction/bluetrack-smart-treadmill-sensor/hardware-requirements.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.